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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ea17e06e3b7915068380dfe2fc4cd7fe0b7074ff447f4290bf8740c65fddba' 
  AND token = '77klYDEx0GJd3npZTXoskBDtPNSCVIDhA5QIHiF8WnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}